将文档中标题列表解析为排序树
问题描述:
我试图解析标题列表(h1
,h2
等)以获取结构良好的JavaScript变量中的内容表(有点像树)。将文档中标题列表解析为排序树
这里是我的文档的结构:
<div id="content">
<h1>The content</h1>blah
<h2 class="show-in-toc">Test 1</h2>
<h3 class="show-in-toc">Test 1.1</h3>
<h3 class="show-in-toc">Test 1.2</h3>
<h4 class="show-in-toc">Test 1.2.1</h4>
<h4 class="show-in-toc">Test 1.2.2</h4>
<h2 class="show-in-toc">Test 2</h2>
<h3 class="show-in-toc">Test 2.1</h3>
<h4 class="show-in-toc">Test 2.1.1</h4>
<h3 class="show-in-toc">Test 2.2</h3>
</div>
这里就是我试图让:
[
{"text": "Test 1","level": 2, "children": [
{"text": "Test 1.1","level": 3,"children": []},
{"text": "Test 1.2", "level": 3, "children": [
{"text": "Test 1.2.1", "level": 4, "children": []},
{"text": "Test 1.2.2", "level": 4, "children": []}
]}
]},
{"text": "Test 2", "level": 2, "children": [
{"text": "Test 2.1", "level": 3, "children": [
{"text": "Test 2.1.1", "level": 4, "children": []}
]},
{"text": "Test 2.2", "level": 3, "children": []}
]}
]
我猜的功能应该是递归的,而且应该是这样的:
headings = $('.show-in-toc:header'); // Maybe .toArray() ?
toc = generateToc(headings, 2); // With 2 being the starting level
我试图启发算法from this subject但我没有得到任何结果(他们直接把结果放到一个dom元素中)。
你有什么建议可以指导我吗?预先感谢您
答
我终于设法做我想要的算法,感谢评论给了我一点提示。这里是the result on a JSFiddle,我会解释它并在稍后评论它,尽管它很容易理解。
function headerTagToObject(tag, level) {
tag = $(tag);
return {
'title': tag.text(),
'level': level,
'children': []
}
}
function generateToc(level, filter = undefined, initial_parent = undefined, parent = undefined) {
var result, tags;
result = [];
if (parent) {
tags = $(parent).nextUntil('h' + (level - 1), 'h' + level).filter(filter);
} else {
if (initial_parent) {
tags = $(initial_parent).find('h' + level).filter(filter);
} else {
tags = $('h' + level).filter(filter);
}
}
tags.each(function(i, tag) {
var tagResult;
tagResult = headerTagToObject(tag, level);
tagResult['children'] = generateToc(level + 1, filter, initial_parent, tag);
result.push(tagResult);
});
return result;
}
// Usage
result = generateToc(2, '.show-in-toc', '#content');
可能重复:https://*.com/questions/187619/is-there-a-javascript-solution-to-generating-a-table-of-contents-for-a-page – Snowmonkey
@ Snowmonkey谢谢你,我没有看到那个。我会试着去研究它,但是起初看起来它的工作方式与我链接的方法非常相似 –